1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020-2021 Bjoern A. Zeeb 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef _LINUXKPI_LINUX_IOPOLL_H 29 #define _LINUXKPI_LINUX_IOPOLL_H 30 31 #include <sys/types.h> 32 #include <sys/time.h> 33 #include <linux/delay.h> 34 35 #define read_poll_timeout(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \ 36 ({ \ 37 struct timeval __now, __end; \ 38 if (_to) { \ 39 __end.tv_sec = (_to) / USEC_PER_SEC; \ 40 __end.tv_usec = (_to) % USEC_PER_SEC; \ 41 microtime(&__now); \ 42 timevaladd(&__end, &__now); \ 43 } \ 44 \ 45 if ((_early_sleep) && (_us) > 0) \ 46 usleep_range(_us, _us); \ 47 do { \ 48 (_var) = _pollfp(__VA_ARGS__); \ 49 if (_cond) \ 50 break; \ 51 if (_to) { \ 52 microtime(&__now); \ 53 if (timevalcmp(&__now, &__end, >)) \ 54 break; \ 55 } \ 56 if ((_us) != 0) \ 57 usleep_range(_us, _us); \ 58 } while (1); \ 59 (_cond) ? 0 : (-ETIMEDOUT); \ 60 }) 61 62 #define readx_poll_timeout(_pollfp, _addr, _var, _cond, _us, _to) \ 63 read_poll_timeout(_pollfp, _var, _cond, _us, _to, false, _addr) 64 65 #define read_poll_timeout_atomic(_pollfp, _var, _cond, _us, _to, _early_sleep, ...) \ 66 ({ \ 67 struct timeval __now, __end; \ 68 if (_to) { \ 69 __end.tv_sec = (_to) / USEC_PER_SEC; \ 70 __end.tv_usec = (_to) % USEC_PER_SEC; \ 71 microtime(&__now); \ 72 timevaladd(&__end, &__now); \ 73 } \ 74 \ 75 if ((_early_sleep) && (_us) > 0) \ 76 DELAY(_us); \ 77 do { \ 78 (_var) = _pollfp(__VA_ARGS__); \ 79 if (_cond) \ 80 break; \ 81 if (_to) { \ 82 microtime(&__now); \ 83 if (timevalcmp(&__now, &__end, >)) \ 84 break; \ 85 } \ 86 if ((_us) != 0) \ 87 DELAY(_us); \ 88 } while (1); \ 89 (_cond) ? 0 : (-ETIMEDOUT); \ 90 }) 91 92 #endif /* _LINUXKPI_LINUX_IOPOLL_H */ 93